In a large skillet, brown turkey in butter on each side. Arrange sweet potatoes around turkey. Combine the cranberries, maple syrup, orange juice and cinnamon; pour over sweet potatoes. Bring to a boil. Reduce heat; cover and simmer for 15-20 minutes or until a meat thermometer reads 170°. Remove turkey and sweet potatoes to a serving platter. Combine cornstarch and water until smooth; add to skillet. Bring to a boil. Cook and stir for 1 minute or until thickened. Serve with turkey and sweet potatoes. Yield: 4 servings.